Abstract: A composite fastener, preferably in the form of a rivet, which comprises a shank having a first head integrally formed on one end thereof, the shank and head formed of a high temperature thermoplastic matrix material selected from the group consisting of a polyether ether ketone resin and a polyamide imide resin, and having continuous reinforcing fibers, such as graphite fibers, axially oriented in substantially parallel relation throughout the shank, the fibers being flared and extending continuously into the head and substantially evenly flared and swaged therein, thereby forming a fastener having high shear and high tensile characteristics.

Abstract: A method and device are provided for sealing a perforation in the wall of, for example, a blood vessel. The device is in the form of a two part closure which seals the hole by clamping the tissue surrounding the hole from both the inside and the outside of the vessel. In accordance with one exemplary embodiment, two rivet portions are provided which are bayonet or screw threadedly interlocked to clamp the vessel wall about the perforation. An alternate embodiment applies heat to couple the rivet parts as well as to cauterize the wound site. Heat may also advantageously be used to separate the rivet from its delivery system.

Abstract: An impact-type expansible plug for anchoring in a cylindrical drilled hole of a concrete part and the like has an expansion sleeve provided with at least one longitudinal slot and expandable in a drilled hole, and also has an expansion sleeve with a conically narrowing internal bore, and an expansion mandrel drivable into the conically narrowing internal bore of the expansion sleeve. The expansion sleeve has a forward end provided with an annular collar having a radially directed circumferential cutting edge, and also has a portion tapering toward the annular collar.

Abstract: A nut for turning onto a threaded stud and having a smooth bore extending from an inwardly-tapering conical lead-in area, the nut being characterized in that in the lead-in area a stripping zone is formed by a plurality of parallel tubular cavities of smaller diameter than the bore of the nut, in that the cavities are spaced apart and arranged symmetrically about the axis of the bore of the nut, in that the axis of each tubular cavity is spaced from the axis of the bore of the nut by a distance smaller than the sum of the radii of the tubular cavity and of the bore and greater than the radius of the bore, in that the intersections of the walls of each tubular cavity with the wall of the bore of the nut form cutting edges, and in that the respectively adjacent tubular cavities are linked to one another via cavities provided therebetween so that a coating stripped from the threaded stud as the nut is turned onto the stud can be accommodated in this cavity.

Abstract: The dowel comprises a body (1), with two elongate lateral arms (4), each having a groove, and a bore, opening out between the arms (4) for a fixing screw (22) to pass through, a rocker (2) sliding and pivoting on the arms (4) of the body (1) by means of two pivots (10) in their grooves, with a ramp which interacts with the end of the screw (22) in order to cause the rocker (2) to pivot, and an orifice for interacting, in the tilted position, with the fixing screw (22) and causing the rocker (2) to slide.Shearable pins (19) are provided for temporarily holding the rocker (2), detachable under the action of the screw (22), and which, when the dowel is inserted into a wall, drive the rocker (2) with the body (1). The body (1) and the rocker (2) are moulded simultaneously a single piece from injectable material.The dowel can be used for fixing a component to a gypsum board.

Abstract: A composite fastener member, in one form, having integral head and shank portions is defined by a plurality of superimposed composite fiber reinforced sheets spirally wound about a longitudinal axis. A plurality of fastener members, oppositely disposed within an opening in an article, define a fastener especially useful in joining lightweight composite structures such as aircraft or aircraft engine components. In another form, the ends of a single spirally wound composite fastener member are splayed to fasten a plurality of sheets.

Abstract: A wall plug type fastener comprises an elongate anchor body having arm members extending radially from the anchor body. Brace members provide support for the anchor body and permit distribution of load forces applied to the anchor. Anti-rotational flanges extending along the anchor body secure the fastener against rotational displacement when installed in a drywall. The anchor body defines a first axial void in alignment with a satellite body defining a second axial void spaced from and coaxial with the anchor axial void.

Abstract: Dowel-like retaining peg (10) of plastics material--particularly for fastening furniture fittings to articles of furniture--which may be fitted by pressing or driven into a bore (16). The retaining peg has an elongate peg portion (18) from whose outer peripheral surface a number of peripheral projecting ribs (20) extend radially, offset in the longitudinal direction of the peg and with a triangular cross-section tapering towards the exterior and defining a respective knife blade-like retaining ridge. Over the major portion of its longitudinal extent the peg portion (18) has a substantially smaller diameter with respect to the diameter (d) of the associated bore (16) and the peripheral annular projections (20) are constructed as annular disc-shaped, elastically deformable fins (20) which are integrally connected to the peg portion (18) and whose external diameter (D) is larger than the diameter of the associated bore (16).

Abstract: The improved metal matrix bolt has a metal shell having the bolt head, shank and threads thereon. The shell has a longitudinal space therein wherein a composite core of fibers is bonded. The fibers are divided into two groups: a longitudinal group and a spiral group. The spiral group wraps clockwise about the longitudinal group and is inclined at an angle of about 30.degree. to 45.degree. degrees from the axis of the bolt. The fibers are bonded within the space to the interior surface of the shell whereby when the bolt is torqued, the bolt has increased tensile strength and reduced thermal axial growth.

Abstract: A fixing element for connecting materials of relatively low strength includes a unitary, one-piece plastic body. An external thread is formed on the plastic body for compressing and compacting the low strength material in the thread turns of the external thread. A first external thread portion has a taper at one end of the plastic body. A second portion has a taper at another end of the plastic body, while a third portion has no taper and extends between the first and second external portions. A penetration tip is connected to the smaller diameter end of the first external thread portion. Further, a stop collar is provided at the large diameter end of the second external thread portion. The penetration tip preferably is a self tapping screw made of a harder material than the plastic body. Further, the thread depth of the second external thread portion decreases along the second external portion as the second external portion approaches the larger diameter of the screw.

Abstract: Bone and tissue connectors are designed for use on or in the human body for the purpose of connecting bone or soft tissue to promote a healing process. Various embodiments are in the form of bands, straps, braids, or rods and are secured by fasteners such as pegs, plates, screws and cable ties. All of the connectors are formed from materials having a similar modulusof elasticity as bone and include, among others, polyethylene, polysulfone, collagen and polymer-carbon fiber composites.

Abstract: High tensile and torque strength threads are provided on a thermoplastic composite rod by first cutting a thread at a relatively short pitch into an end of the rod. Thermoplastic composite tape is then wound in tight conformance to the cut thread so that the fibers of the tape align with the desired helix angle of the thread to be created. The rod and the tape are heated at their junction to above melt temperatures during the winding process to increase adhesion between the rod and the tape. While the end of the rod and the wound tape are at above melt temperatures, the end of the rod and the tape are compressed in a die conforming to the desired ultimate configuration of the thread. The tape and rod are then permitted to cool until sufficiently hardened to permit release of the compressing die without deformation of the threaded end of the tape. The result is a thermoplastic composite rod having high tensile and torque strength at its threaded end.

Abstract: A pole sign construction comprising a vertical pole support;pairs of upper and lower brackets secured to the pole and having outwardly projecting aligned bolts; a pair of rectangular base sign boards of corrugated plastic material having a series of connecting holes formed in their lateral edges; a plurality of first clear plastic locking washers and clear plastic bolts connecting the corrugated sign boards in back-to-back relation around the vertical pole; spaced pairs of mounting holes formed in the upper and lower edges of each of the corrugated sign boards; locking washers securing the boards to the brackets on the projecting bolts, the bolts passing through the upper and lower mounting holes;overlay sign boards congruent with the base sign boards and secured to the plastic bolts with second clear plastic locking washers.

Abstract: An insertable moldable ratchet rivet assembly of a unitary construction for securing a plurality of panels together includes a drive-pin insert of a unique construction to facilitate the pull-up operation with a reduced amount of force and to form slots in the shank of a rivet housing. The drive-pin insert includes a body portion having a plurality of segments which are spaced apart from each other to form recessed flattened surfaces therebetween. Each of the flattened surfaces is provided with a plurality of lengthwise-spaced horizontal teeth. The rivet housing includes a head flange and a shank. The rivet shank is formed of a plurality of shank wall portions extending substantially from the rear surface of the rivet head flange. The plurality of shank wall portions are spaced apart from each other to provide slots therebetween which are formed by the plurality of segments on the body portion of the drive-pin insert.

Abstract: A fastening device in the form of a plug and a screw is adapted for installation in a blind bore of a thick wall or in a through hole in a thin wall. The plug is formed as an elongated body having a central longitudinal hole. The body has inner and outer end portions and two parallel slots extending longitudinally between the end portions to define four legs arranged circumferentially around the body. The legs diverge from the end portions to form an increasing diameter for the body which reaches a maximum at the center of the body. When the plug is inserted into a blind bore the legs are displaced inwardly to reduce the size of the central longitudinal hole so that when the screw is inserted into the plug, the screw will exert force on the legs to press the legs against the wall with strong radial forces.

Abstract: The invention concerns a multi-part dowel with an outer body (2), which has an approximately cylindrical shank (4) and an inner body (12). In the position of use, the outer body (2) and inner body (12) engage with each other in the same way as a multiple screw-thread. The outer body (2) has, in its solid shaft (4), helical grooves (8) which are positioned to form a star when viewed in cross-section and which form an internal screw-thread. The inner body (12) has matching helical ribs (14) also positioned to form a star. The pitch of the thread is greater than the length of the thread. In what is the front section of the outer body (2) when the dowel is used, the grooves themselves, or slots (10) aligned with them, extend to the outer wall of the outer body (2). The dowel can be used for fixing building materials, such as woven textile or fibre-glass materials, to outside walls, interior walls or ceilings.

Abstract: A jack (1) has a flat base (2) attached to a support (3) at the top by a lever-operated mechanism. The mechanism is activated by a threaded shaft (5) and nut (6). The nut has a coaxial gudgeon (10 & 11) on each side. The gudgeons extend across the axis (22) of an interior-threaded section. The nut consists of two halves (13 & 14). The halves fit together at a flat interface (15). The interface parallels both the axis (21) of the gudgeons and the axis (22) of the threaded section (23).

Abstract: An improved mill and drill pad fastener is described which uses a base and a polymeric pad which is less susceptible to cracking when a torque is applied such as is generated when a self-tapping screw is used. The improved fastener eliminates the need for a metal-reinforcing band around the polymeric pad component by the geometric design of the base, which also eliminates the ability of the pad to twist or to be pulled from the base. Additionally, a completely polymeric mill and drill pad fastener is described.

Abstract: A clip for attaching an ornamental member to a wall member such as a vehicle body panel. The clip has a head continuously connected with a portion locking the ornamental member. The head is pressed against one surface of the wall member. The clip also has a leg extending from the head and is inserted into a through hole in the wall member. Pawls are formed at a maximum diameter portion of the leg and pressed against the other surface of the wall member to fixedly hold the leg onto the wall member. Pliable thin-walled resin is coated through secondary forming around the respective outer peripheries of the pawls and the leg for preventing damage of an inner periphery of the through hole when the leg is inserted into the through hole.

Abstract: A tightening member molded from hard synthetic resin containing carbon fiber developed from hyperfine particles of a high-melting metal and/or a compound of the high-melting metal by use of vapor phase system for thermally decomposing hydrocarbon. The tightening member effectively prevents electrification of static electricity due to its high conductivity given by the carbon fiber and is bestowed with mechanical properties such as tensile strength.

Abstract: A carbon and/or ceramic fiber reinforced carbon and/or ceramic matrix composite threaded member including a core, a fiber containing thread-defining element bonded to the exterior of the core and a reinforcing fabric layer securing the thread-defining element to the core. The thread-defining element may be an integral part of a tubular braided reinforcing fabric or applied to the core prior to application of a reinforcing fabric layer. Externally and internally threaded members and methods for their manufacture are described.

Abstract: A stop (1) for supporting a side of concrete form work (12) includes a deformable section (2) in the form of a collapsible sleeve (2) with an abutment (8). The sleeve is formed monolithically with the stop. A nail (13) with a head (13a) secures the stop (1) to a concrete structure or component (11) and when the nail (13) is driven its head (13a) runs up against the abutment (8). If energy in excess of the amount needed to drive the nail (13) in is present, the nail head (13a) striking the abutment (8) axially collapses the sleeve and damage to the stop (1) is avoided.

Abstract: A washer molded from a polymeric material and useful with a fastener having a head and a shank, such as, for example, a screw or a drive pin, and a fastening assembly comprised of the washer and such a fastener, is disclosed. The fastener head is contained within a washer socket with the fastener shank extending through a washer aperture. An integral flap hinged from a lateral wall portion of the washer socket is used to substantially cover the fastener head. The flap has a curved end, which is adapted to be snap-fitted under a locking formation, comprising a curved lip, formed upon a lateral wall portion of the socket which is disposed opposite the lateral wall portion upon which the flap is hinged.

Abstract: A threaded member including a core, a thread-defining element helically extending around and along the core and a reinforcing tubular fabric layer bonded to the exterior surface of the combined core and thread-defining element. The radial projection of the thread-defining element defines a helical thread whose contour is followed by the fabric layer and the exterior surface of the threaded member. The composite threaded member may be formed by forming a braided or knit fabric layer on an elongated spiral wrapped core. The spiral wrapped thread-defining element and the fabric reinforcing layer is bonded to the core. A polymer sheath protects the underlying structure.

Abstract: A composite fastener which provides up to 70 KSI in shear strength in a 1/4 inch shank diameter and includes several layers having long parallel carbon fibers embedded in resin. The layers are pressed together and heated to form a panel. The panel is cut into bars which are then machined into rods, used to form threaded or unthreaded composite shear pins. The fibers in adjacent layers are angled with respect to one another to provide maximum shear strength in a particular direction. The head of the shear pin is preferably marked to indicate the orientation of maximum shear strength.

Abstract: A plastic hex shaped tubular fastener which is to be secured to a threaded stud. A plurality of spaced flexible tongues which project radially inwardly near the bottom of the body locate within the screw of the stud when pushed on the stud and when so located projecting cams carried on vertical ribs spaced from the tongues locate within the screw thread so that the fastener can then be screwed tight.

Abstract: A threaded member including a core having an integral tubular braided layer bonded to the exterior surface of the core. The braided layer includes at least one element of greater radial projection which defines a helical thread on the exterior surface of the core. The composite threaded member may be formed by forming a braided layer on an elongated core. The braided layer includes at least one element of greater radial projection relative to the core than the remainder of the elements forming the braided layer. The element of greater radial projection defines a helical thread on the core. The braided layer is bonded to the core.

Abstract: A metallic threaded composite fastener, particularly suited for high temperature applications, has a body member made of high temperature-resistant composite material with a ceramic coating. The body member has a head portion configured to be installed in a countersunk hole and a shank portion which is non-circular and tapered. One part of the shank may be non-circular and the other part tapered, or the two types of surfaces could be combined into a frustum of a non-circular cone. A split collar member made of high strength, high temperature-tolerant metal alloy is split into two halves and the interior of the halves are configured to engage the shank. The exterior of the collar has external threads and the upper portion of the collar has a circumferential groove which receives a lock ring to secure the collar halves to the shank.

Abstract: A composite threaded collar is fabricated from a panel consisting of multiple layers of fiber reinforced tape, bonded together to form a rigid composite structure. The tape comprises a plurality of longitudinally extending continuous fibers that are joined together by a suitable bonding agent. The stack of properly oriented tape layers is heated while a compressive load is applied, followed by cooling. The rigid panel thus formed is then cut, tapped and machined to form the desired configuration of the collar. A twist off driving portion of the collar will shear between tape layers at an annular notch at a predetermined torque.

Abstract: A hollow composite internally threaded member such as a nut includes a reinforcing fabric layer such as a braided or knit layer extending in the axial direction of the member and conforming to its threads and an exterior cross-sectional configuration defined by a tubular braided triaxial fabric having axially extending elements of greater size than the remainder of the elements forming the triaxial fabric. A method of making such an internally threaded member comprises forming and embedding in a mtrix at least one reinforcing fabric layer and one triaxial fabric layer on an externally threaded cylindrical core and thereafter removing the core. Such internally threaded member may be threadedly joined and bonded to an externally threaded member of complementary thread pitch and thread diameter to form a bolt. The externally threaded member may comprise an elongate core having an integral tubular fabric layer bonded to its exterior surface.

Abstract: A reinforcement member for a plastic laminate structure consisting of at least two laminate layers bonded to one another, the member having a synthetic body defining a length axis X, a breadth axis Y, and a thickness axis Z, formed of a synthetic plastic material, the length and breadth axes X and Y lying in a first plane, and the thickness axis Z lying in a second plane normal to the first plane, a plurality of first reinforcement fibres lying parallel to the first plane, and, a plurality of second recruitment fibres lying parallel to the second plane.

Abstract: The threaded split-bushing fastener assembly has been designed for high temperature applications such as on hypersonic vehicles. The fastener assembly consists of a pin (with a standard countersunk head at one end and a tapered end at the other end), a tubular threaded split-bushing, a nut, and a washer. Installation is accomplished by inserting the pin in the parts to be fastened, then slipping the washer and split-bushing on the tapered end of the pin and finally screwing the nut onto the split-bushing. Tightening of the nut allows preloading of the fastener assembly.

Abstract: A grommet has a female member and a male member. Each member consists of a sleeve with a flange formed at one end. The sleeve of the male member is slightly smaller than the bore of the sleeve of the female member. A locking mechanism for the grommet consists of an annular groove inscribed within the inner surface of the sleeve of the female member and a slightly-offset, matching annular lip formed upon the outer surface of the sleeve of the male member. The annular groove and annular lip are offset so that the two members remain in tension, pulling toward one another when the grommet is locked in place. The grommet is locked in place by inserting the male member into the female member and urging them together until the annular lip fits within the annular groove. The grommet may be disassembled by placing a dowel or like object against the non-flanged end of the male member and striking the male member or otherwise applying a force thereto.

Abstract: A fastener is provided which comprises a head component; a barbed shank component; and a resilient linking means connecting the head and shank components. The fastener has a longitudinal opening adapted to receive a tool for the application of force in a driving engagement with the shank component. Also provided is a method of fastening a plate member to an internally ribbed work piece using this fastener by engaging the fastener with the ribbed aperture in the work piece; inserting the tool into the longitudinal opening; and applying force to the shank component sufficient to cause axial displacement of the shank component against the resilient biasing of the linking means to maintain the head and shank components in axial tension.

Abstract: A screw-in plug provided with a pointed conical thread section (4) and an insertion point (5) has a stop collar (6) adjoining the thread section (4). A head (7) moulded onto the stop collar (6) serves as a bearer of a screwing-in slot (13) and of a moulded-on holding member (14). The plug, preferably made in one part out of plastic, can be screwed into any wall covering of low strength, and permits the provisional or permanent mounting of varied useful objects.

Abstract: A faucet extended nut for both anchoring a faucet to a sink and connecting the faucet to a water supply line under confined conditions. The nut includes an outer extended part adapted to be threadedly rotated on a faucet stem extending through an opening in the sink top to draw the faucet tightly against the upper side of the sink and an inner extended part adapted to be threadedly received within the outer part to force the end of a water supply line into sealing engagement with the stem. Each of the parts are of sufficient length to extend below the sink's bowl, and wrench engaging flats are defined on the lower end of the parts to apply torque to the parts without having to work in the confined area defined between the sink's bowl and the adjacent wall.

Abstract: A fastener assembly for securing layers of roofing material to a deck includes a nut for insertion in and engagement with a pre-drilled hole in the deck and a threaded bolt for engagement with the nut. The nut is provided with resilient legs that are disposed both above and below the hole and that deflect outwardly upon being engaged by the bolt to prevent removal of the nut from the hole. The shank of the bolt is provided with a groove that engages edge portions on the nut legs to prevent counter rotation of the bolt.

Abstract: Adjacent the free end of a flexible hose (22) an external thread (20) of elastomeric material is bonded or vulcanized to the external surface (21) of hose (22). A sleeve (1) is threaded onto and adhesively bonded to the external thread (20). The sleeve (1) consists of a sleeve body (2) of plastic or elastomeric material and a metallic ring (3) preferably of spring steel. The ring (3) is molded into the sleeve body (2). Part of its surface constitutes a shoulder for engagement by a cam of a coupling lock. The sleeve (1) is cheaper to manufacture and more durable than metallic sleeves.

Abstract: The utility of a cover for vents or drains is improved by having a unitary, integral fastening means which can be used to either secure the covering so securely that mutilation of the cover may be required to remove the cover or that the cover may be easily removed and replaced. The cover can be formed from any polymer with any desired surface configuration, i.e., hole size and shape, and can be used to modify existing covers or as the original cover for a hole or vent. The fastening means when integral is made of the same material as the cover and can be easily expanded and secured by pressure elements. Since the normal sleeve has been replaced by the integral fastener which is part of the cover, no relative rotation of the sleeve and pressure means can occur.

Abstract: A clip for attaching an ornamental member to a wall member such as a vehicle body panel. The clip has a head continuously connected with a portion locking the ornamental member. The head is pressed against one surface of the wall member. The clip also has a leg extending from the head and is inserted into a through hole in the wall member. Pawls are formed at a maximum diameter portion of the leg and pressed against the other surface of the wall member to fixedly hold the leg onto the wall member. Pliable thin-walled resin is coated through secondary forming around the respective outer peripheries of the pawls and the leg for preventing damage of an inner periphery of the through hole when the leg is inserted into the through hole.

Abstract: A hollow composite internally threaded member such as a nut includes a reinforcing fabric layer such as a braided or knit layer extending in the axial direction of the member and conforming to its threads. A method of making such an internally threaded member comprises forming and embedding in a polymeric matrix a reinforcing fabric layer on an externally threaded cylindrical core and thereafter removing the core. Such internally threaded member may be threadedly joined and adhesively bonded to an externally threaded member of complementary thread pitch and thread diameter to form a bolt. The externally threaded member may comprise an elongate core having an integral tubular fabric layer bonded to its exterior surface.

Abstract: A fluid flow control valve has a diaphragm for sealing against a valve seat. The diaphragm includes a bleed hole for passing fluid from one side of the diaphragm to the other. A debris arrestor comprising a one-piece flexible tag is inserted into the bleed hole by deforming the tag to pass therethrough. The tag after insertion expands to retain itself in the bleed hole.

Abstract: A plastic hollow wall anchor having folding arms for insertion within a limited diameter aperture in a substrate such as a wall. The arms, adjacent their overlapping attachment areas, are configured to provide a "sharp knife edge" intersection, whereby a spacing between the attached arms, during folding and aperture insertion, is substantially eliminated. The load bearing arms are concomitantly thickened and thereby strengthened within the limited dimension afforded by the aperture. Alternatively, the overall dimensions of the anchor are reduced, while maintaining the load bearing arm dimensions, thereby enabling the use of a smaller diameter for the insertion aperture without decrease in anchor holding strength.

Abstract: A quarter-turn fastener for securing together a plurality of overlapped panels comprises an elongated body portion having a longitudinal axis, a head provided upon one end of the body portion for engaging a first outer surface of one of the overlapped panels, and a pair of resiliently flexible fingers provided upon an opposite end of the body portion for engaging a second outer surface of a second one of the overlapped panels whereby the panels are preliminarily secured together by the fastener in a non-compressed state. A pair of diametrically opposed inclined cam portions are also provided upon the body portion at a position axially between the opposite ends of the body portion so as to engage the second outer surface of the second one of the overlapped panels such that when the fastener is rotated through means of an angular rotation of 90.degree.

Abstract: A standoff retainer is provided for effecting the securing of two panels to each other in spaced planar facing relationship. The retainer lockingly engages a push pin after being received in snap-fit relationship by one of the panels. Ribs on the retainer space the panels, and a funnel surface on the retainer facilitates engagement with the push pin.

Abstract: A self-licking stud assembly including male and female segaments. The male segment includes a base for mounting or being integrally molded on a panel member to be joined with a second panel member in a side-by-side relationship, a central stem extending from teh base, with a plurality of equally spaced deflectable fingers formed on the end thereof so as to extend outwardly and toward the base. The female segment includes a base for mounting or being integrally molded on the second panel member, a flange or collar formed on one side of the base, and an opening through the base and the collar, with a frustoconically shaped surface formed on the inner surface of the collar. The outer edges of the fingers are selectively shaped to lockingly cooperate with the frustoconically shaped surface once the fingers are urged through the opening.

Abstract: The present invention involves a construction sheet material installation tool used to assist a worker to install sheets of material that would ordinarily require more than one worker. The tool includes a screw that has its non-threaded end embedded into a base, and the threaded portion of the screw extends outwardly perpendicular from the top surface of the base. The base has at least one side ledge that extends downwardly from the top surface at an obtuse angle. The top surface and side ledge of the base are all widened as to provide support to common construction sheet material without damaging the same. It is used by partially screwing into the overhead surface on which the construction sheet material will be installed to leave a gap. One end of the construction sheet is lifted to engage the side ledge of the device. The construction sheet material is then pushed upward from its opposite end into the gap and securely held in place by the invention, until the sheet material can be permanently installed.

Abstract: A fastening device uses a ribbed rivet to secure two materials together. The ribs on the rivet should have a height no greater than 0.005 inches on most plastics and be of a close proximity. This rivet can be pushed directly into, or pulled directly out of, a ribbed receiving bore without fear of stripping the threaded ribs. The rivet can be manufactured in a two-piece injection plastic mold in which the rivet is fully formed in the lower half of the mold. Because of the height and proximity of the ribs, the rivet can be removed from the mold without stripping the threaded ribs. Furthermore, the rivet can be formed in the same injection molding operation used to manufacture the receiving bore into which it is to be inserted.

Abstract: A plastic part 1 for engagement with threaded bolts, especially coarsely threaded bolts, includes an opening 2 with several elastic catch points 3 which, in the zone of engagement with the threads of the bolts, are provided with stepped graduations. Guide elements are located in the interspaces between the catch points 3 and are distributed in spaced relationship over the circumference of the opening 2. The guide elements 4 are designed springy or resilient and may be, for example, resilient hollow bodies or springy stays.

Abstract: A plastic fastening element 1 for installation in a substantially rectangular opening of a support includes head part 2 and a holding part 3. Holding part 3 is substantially rectangular in cross section and is provided with lamella-form fingers 4 on the longer sides positioned in groups lying opposite each other. Stays (5) extend along the holding part 3 and limit the edge zone of the fingers. According to the invention, the stays are resilient straps 7 wherein the beginning zones 8 of the two straps 7 lie opposite each other on different sides of the holding part 3. The straps are arranged oblique to each other and merge into a conical push-in zone 23 with oblique side surfaces 24. The head part 3 is designed for holding a strip-form object.